About 70 miles west of Key West, Florida, lies Dry Tortugas National Park which is world-renowned for picturesque blue sea waters, white sands, brightly colorful coral reefs, abundant marine life, and legends of shipwrecks and sunken treasures. There are seven small islands in the 100-square mile park, but it is mostly open water that is accessible only by boat or seaplane. Dry Tortugas is also famous as the home of magnificent and historic Fort Jefferson, the largest masonry building in the Western Hemisphere. Though it was not finished, the fort has more than 16 million bricks that make up the massive 45-foot-high, three-level hexagon, coastal fortress that has 2,000 architecturally beautiful arches. [44 Fabulous Photos]

Aerial of Fort Jefferson on Garden Key, part of Dry Tortugas National Park. The park is located at the farthest end of the Florida Keys, closer to Cuba than to the USA mainland. NPS says, “To reach this remote ocean wilderness one must travel by boat or plane over 68 nautical miles of open sea.” Garden Key is the second largest island in this chain. Photo #1 by National Park Service

Truk Lagoon, known as Chuuk – a group of tropical paradise islands in the Federal States of Micronesia – offers adrenaline-junky scuba divers a cool yet creepy underwater adventure in shark-infested Pacific waters while wreck diving the mysterious Ghost Fleet of Truk Lagoon. More than 50 major shipwrecks from WWII litter the seabed, making the undersea wonder of the world the best shipwreck diving destination on the globe. In 1944, Americans launched Operation Hailstone, which has been called the Japanese Pearl Harbor, and the bombardment lasted for three days. The attack wiped out 60 ships and 275 airplanes, sinking them to the bottom of the lagoon, so that now it is the biggest ship graveyard in the world. Most of the wrecks were left untouched for nearly 25 years since people feared setting off the thousands of sunken bombs. Many of the shipwrecks in the scuba diving paradise have full cargo holds full of fighter aircraft, tanks, bulldozers, railroad cars, motorcycles, torpedoes, mines, bombs, boxes of munitions, radios, thousands of various weapons, human remains, and other artifacts. More than 3,000 people were thought to have been killed and some divers swear that the wrecks in Truk Lagoon are haunted. Destination Truth conducted an underwater ghost hunting expedition in Truk Lagoon. While diving at the Hoki Maru, the divers recorded sounds of running engines in the cargo hold full of trucks. Here’s a virtual adventure with wreck divers who explored and photographed the Ghost Fleet of Truk Lagoon. This is underwater awesomeness! We love these pics! [33 Photos]